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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair value measurement of assets and liabilities on a recurring basis
                         
 
                 
    Level 1  
    September 30     December 31     September 30  
in thousands   2011     2010     2010  
 
                 
Fair Value Recurring
                       
Rabbi Trust
                       
Mutual funds
    $12,816       $13,960       $13,146  
Equities
    5,746       9,336       7,456  
 
                 
Total assets
    $18,562       $23,296       $20,602  
 
                 
                         
 
                 
    Level 2  
    September 30     December 31     September 30  
in thousands   2011     2010     2010  
 
                 
Fair Value Recurring
                       
Medium-term investments
    $0       $0       $3,910  
Interest rate swaps
    0       0       (3,044 )
Rabbi Trust
                       
Common/collective trust funds
    1,965       2,431       2,361  
 
                 
Net asset
    $1,965       $2,431       $3,227  
 
                 
Fair value measurement of assets on a nonrecurring basis
                 
 
           
    As of December 31, 2010  
            Impairment  
in thousands   Level 3     Charges  
 
           
Fair Value Nonrecurring
               
Property, plant & equipment
    $1,536       $2,500  
Assets held for sale
    9,625       1,436  
 
           
Totals
    $11,161       $3,936